Seal ring



Mrehzs, 1932. M. H. ACKERMAN 1,851,076

' s'AL RING Filed Aug. 2, 1928 2 sheets-snet 1 I rLTLQJ.

At-arlenaa Maa 29, ieee NETE@ STATES Param ermee MICHAEL HENRY ACKERMAN,OF MANSFIELD, OHIO, ASSIGNOR OF ONE-HALF TO LOUIS i C. SICKEL, OFCALEDONIA, OHIO SEAL RING Application led August 2, 1928. Serial No.297,056.

rllhis invention relates to a coinposite seal ring and constitutes animprovement upon the structures disclosed in my copending applicationstiled January 28, 1928, Serial Numa s ber 250,224 and May 2nd, 1928,Serial vNumber 274,586.

v@ne of the objects of the invention is to provide a seal ring carriedby the bushing forming a part of the shaft bearing, said m bushing beingformed with the necessary recess for the-reception of the seal ring.

A further object is to provide improved means whereby pressure fromwithin the coin-y pressor or the like with which the'seal ring i is usedcan be directed back of the ring to maintain a tight connection betweenthe seal ring and the working element cooperating therewith.

Another object is to provide an emergency outlet for the bearing wherebyany gases that might leak rom any cause through the bearing, canbeconducted to a point outside the building so that no harmfulvetfectswill result, this feature being particularly desirable in meat markets,restaurants, etc. where leakage of ammonia from refrigerating apparatusalways interferes seriously f with business.

With the foregoing and other objects in view which will appear as thedescription proceeds the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed it being understood that changes in the preciseembodiment of the invention herein disclosed may be made within thescope .owhat is claimed without departing from the spirit of theinvention.

ln the accompanying drawings the preferred forms of the invention havebeen shown.

1n said drawings,

Figure 1 is a section through the improved seal ring and adjacentparts.`

Figure 2 is an enlarged section through n a portion of the ring andadjacent parts.

Figure 3 is a section -through a portion of a diierent form of ring.

Figure 4: is a similar view showing another form of blowout resistancecombined with the seal ring illustrated `in Figure 3.

Referring to the figures by characters of reference 1 designates aportion of the crank case housing of a compressor, the outer end thereofbeing formed with an annular guard flange 2 defining a recess 3. Abushing A is seated in the housing 1 and has' a tight tit, this bushingbeing formed, in its outer end, with an annular groove 5 in which isseated a packing ring 6 of rubber or othersuitable resilient material.The inner face of this ring is engaged by a washer 7 against whichthrust coiled springs'S seated in reces-ses 9 formed in the bushing andopening through the outer surface thereof. A ring 10, preferably ofsteel, is seated in the outer portion of recessor groove 5 and bearsagainst the outer surface of the ring 6, suitable projections 11 beingformed on the ring 10 for engaging ring 6 to assist in making a gastight joint if so desired.

A oove 12 is formed in the inner surface ofthe bushing for conductinglubricant to an annular groove 13 also formed in the bushing and fromthis annular groove small ports 14 lead to the respective recesses 9.

ln the structure illustrated in Figures 1 and 2 one end of a shaft 15 isjournaled in the bushing 4 and has its tapered terminal portionl-detachably engaged by the hub 17 of a wheel 18.

@ne end of the hub' portion 17 is formed with a concentric bearingHarige 19 so' proportioned and located that, when the parts are properlyassembled, it will have a tight working fit against the ring :10. Thehub portion 17 extends into the recess 3 anda sealed con-A -nection isprovided between the hub and the iange 2 by expansible metal sealingrings 20' which bind tightly against the .inner periphery oft-he fiange2 (which is the wall of the recess 3) formed in the hub. Thus an annularchamberA is formed by recess 3 between the rotatable and extend intoannular grooves 21 portion or hub 17 and the member 1 and i y around theinner end of the said hub.

One or more vent ports 22 are provided within the flange 2 andcommunicate with the snare 3 between the hub 17 and the hous- .45 'rings30 like the rings 2O and which serve to prevent leakage of gas fromrecess 31 should` ing 1. A vent pipe 23 is employedfor ccnl ducting gasfrom the space or recess 3 through the port or ports 22 to theatmosphereoutside of the room in which the compressor is located, thereby toprovide controllable means for the escape of `gas trapped around theinner end of the hub 17 and within recess or chamber 3.

In practice the seal ring is assembled with' thebushing 4 after saidbushing has been assembled with the housing and thereafter the wheel hub17 is placed in position and tightened. The seal ring, cooperating withthe flange 19 will form a tight connection designed toprevent leakage ofgas under pressure from the space `surrounded by ange 19. If, however,there should be any such leakage resulting from any cause. the gas willenter the space between hub 17 and housing 1 where it will be restrainedbythe. rings 20. Consequently instead of escaping around the hub, thegas will be trapped and follow the course of least resistance, flowingoutwardly through the pipe 23 to a point where it can be delivered intothe atmosphere without pro ducing the objectionable results occurringshould there be a leakage at the bearing.

Although the vent pipe 23 has been shown in combination with a structureutilizing the particular form of seal ring illustrated in Figures 1andl2 it :is to be understood -that it can be employed in connectionwith other forms of bearings, 'mechanical sealing de-a vices, stufiingboxes, etc. wherever there is likely'to be accidental leakage of gas andit is desired to conduct the gas to an outside or remote point. InFigure 3 the went pipe 24 is shown extended 'from the ange 25 of aAhousing26 in which is seated a bushing 27. The seal ring 28 is supportedin thehousing v beyond the bushing and is similar' to the one disclosed,for example, -in my application y type as that shown i'n my Qcopendingcases.

250,224. The hub 29 of the wheel mounted on shaft 30 is provided withexpansible sealing it escape past the sealing ring 28. This structure,illustratedjn Figure 3, is designed rimanly toy show an application ofthe sa ety pipe to a sealing structure of the same general It might bestated that, instead of using.

i 32 is such that it wi making a gas tight joint temporarily duringtheperiod the escaping gases have suicient velocity. The desiofn andassembly of ring ll slip into a `neutral position when the shaft isrotated without a frictional rotating contact on the hub 34 or ,the ring36.

What is claimed is: 1. The combination with a rotatable shaft and abearing structure-through which it extends,`the outer end of saidstructurebeing recessed, ofa sealing ring within said structuresurrounding the shaft, a member rotatablev with the shaft and extendinginto' the recess, said member having a' working fit upon the sealingring, asealing working connection between said rotatable member and therecessed outer end of the bearing structure thereby to provide'anannular chamber for trapping gas leaking past the sealing ring, andmeans for controlling the vleakage of gases, including means forconveying leaking gases from the recess to a Apoint remote from thebearing structure.

2. The combination with a rotatable shaft and a housing throu h which itextends, of a bushin for the sha t in the housing, a compressibe ringextending around the bushing and between the bushing and the housing, abearing ring'engaging the outer side of the compressible ring, a memberrotatable with l the shaft, means carried by the bushing for pressingthe compressible ring against the bearing ring to expand it against thehousing an bushing and in runm g contact with said member, said bushingextending through the rings, and means ,for conducting to a point remotefrom the housing gases escapmg past the sealing'ring, thereby to controlleakage.

3. The combination with a bearing `structure, a bushing therein and ashaft ,journaled in the bushing, of a compressible ringfseated inthe'bearing structure, a bearing ring engaging the outer surfacethereof, one end of wthe bushing being extended through the rings,

.springs seated in thebushing, a `member tact with the bearing structureand the bushing, and hold the bearing. ring in sealing coni expansiblerings such as shown at 20 and 30,- tact with said member, means on thebearing u l so `around' an -can be held `assembled with flange 34 by areit may 'be possible2 under some conditions, to mount a packing ring 32in a recess 33 formed inthe Han e 34. This packing will extend tsnuglyagainst the hub 35l and taining ring 36. .A circular coiled spring 32can be used for holding the packing ring tight' enough to rotate withhub 3 5 should gas escape through the packingforjoint of seal 28.

The velocity of these gases passing through the restricted outlet at 33will force the lip of the cup leather 32 against the retainer ring 36structure cooperating withl the member on the n eessed, of a sealingring within said structure surrounding the shaft, a member on the shaftand in the recess, said member having a working fit against the sealingring, a sealing

